diff --git a/compiler/collections/src/all.rs b/compiler/collections/src/all.rs
index 965fd819eb..f473ef4e97 100644
--- a/compiler/collections/src/all.rs
+++ b/compiler/collections/src/all.rs
@@ -28,8 +28,11 @@ pub type SendMap<K, V> = im::hashmap::HashMap<K, V, BuildHasher>;
 
 pub type SendSet<K> = im::hashset::HashSet<K, BuildHasher>;
 
-pub type BumpMap<'a, K, V> = hashbrown::HashMap<K, V, BuildHasher, hashbrown::BumpWrapper<'a>>;
-pub type BumpSet<'a, K> = hashbrown::HashSet<K, BuildHasher, hashbrown::BumpWrapper<'a>>;
+// pub type BumpMap<'a, K, V> = hashbrown::HashMap<K, V, BuildHasher, hashbrown::BumpWrapper<'a>>;
+// pub type BumpSet<'a, K> = hashbrown::HashSet<K, BuildHasher, hashbrown::BumpWrapper<'a>>;
+
+pub type BumpMap<K, V> = hashbrown::HashMap<K, V, BuildHasher>;
+pub type BumpSet<K> = hashbrown::HashSet<K, BuildHasher>;
 
 pub trait BumpMapDefault<'a> {
     fn new_in(arena: &'a bumpalo::Bump) -> Self;
@@ -37,31 +40,35 @@ pub trait BumpMapDefault<'a> {
     fn with_capacity_in(capacity: usize, arena: &'a bumpalo::Bump) -> Self;
 }
 
-impl<'a, K, V> BumpMapDefault<'a> for BumpMap<'a, K, V> {
-    fn new_in(arena: &'a bumpalo::Bump) -> Self {
-        hashbrown::HashMap::with_hasher_in(default_hasher(), hashbrown::BumpWrapper(arena))
+impl<'a, K, V> BumpMapDefault<'a> for BumpMap<K, V> {
+    fn new_in(_arena: &'a bumpalo::Bump) -> Self {
+        // hashbrown::HashMap::with_hasher_in(default_hasher(), hashbrown::BumpWrapper(arena))
+        hashbrown::HashMap::with_hasher(default_hasher())
     }
 
-    fn with_capacity_in(capacity: usize, arena: &'a bumpalo::Bump) -> Self {
-        hashbrown::HashMap::with_capacity_and_hasher_in(
-            capacity,
-            default_hasher(),
-            hashbrown::BumpWrapper(arena),
-        )
+    fn with_capacity_in(capacity: usize, _arena: &'a bumpalo::Bump) -> Self {
+        //        hashbrown::HashMap::with_capacity_and_hasher_in(
+        //            capacity,
+        //            default_hasher(),
+        //            hashbrown::BumpWrapper(arena),
+        //        )
+        hashbrown::HashMap::with_capacity_and_hasher(capacity, default_hasher())
     }
 }
 
-impl<'a, K> BumpMapDefault<'a> for BumpSet<'a, K> {
-    fn new_in(arena: &'a bumpalo::Bump) -> Self {
-        hashbrown::HashSet::with_hasher_in(default_hasher(), hashbrown::BumpWrapper(arena))
+impl<'a, K> BumpMapDefault<'a> for BumpSet<K> {
+    fn new_in(_arena: &'a bumpalo::Bump) -> Self {
+        // hashbrown::HashSet::with_hasher_in(default_hasher(), hashbrown::BumpWrapper(arena))
+        hashbrown::HashSet::with_hasher(default_hasher())
     }
 
-    fn with_capacity_in(capacity: usize, arena: &'a bumpalo::Bump) -> Self {
-        hashbrown::HashSet::with_capacity_and_hasher_in(
-            capacity,
-            default_hasher(),
-            hashbrown::BumpWrapper(arena),
-        )
+    fn with_capacity_in(capacity: usize, _arena: &'a bumpalo::Bump) -> Self {
+        //        hashbrown::HashSet::with_capacity_and_hasher_in(
+        //            capacity,
+        //            default_hasher(),
+        //            hashbrown::BumpWrapper(arena),
+        //        )
+        hashbrown::HashSet::with_capacity_and_hasher(capacity, default_hasher())
     }
 }
 
diff --git a/compiler/load/src/file.rs b/compiler/load/src/file.rs
index cf262fd3d4..5a75ad93bd 100644
--- a/compiler/load/src/file.rs
+++ b/compiler/load/src/file.rs
@@ -774,7 +774,7 @@ enum Msg<'a> {
         module_id: ModuleId,
         ident_ids: IdentIds,
         layout_cache: LayoutCache<'a>,
-        external_specializations_requested: BumpMap<'a, ModuleId, ExternalSpecializations<'a>>,
+        external_specializations_requested: BumpMap<ModuleId, ExternalSpecializations<'a>>,
         procedures: MutMap<(Symbol, Layout<'a>), Proc<'a>>,
         problems: Vec<roc_mono::ir::MonoProblem>,
         module_timing: ModuleTiming,
@@ -976,7 +976,7 @@ enum BuildTask<'a> {
         module_timing: ModuleTiming,
         layout_cache: LayoutCache<'a>,
         solved_subs: Solved<Subs>,
-        imported_module_thunks: BumpSet<'a, Symbol>,
+        imported_module_thunks: BumpSet<Symbol>,
         module_id: ModuleId,
         ident_ids: IdentIds,
         decls: Vec<Declaration>,
@@ -3831,7 +3831,7 @@ fn make_specializations<'a>(
 fn build_pending_specializations<'a>(
     arena: &'a Bump,
     solved_subs: Solved<Subs>,
-    imported_module_thunks: BumpSet<'a, Symbol>,
+    imported_module_thunks: BumpSet<Symbol>,
     home: ModuleId,
     mut ident_ids: IdentIds,
     decls: Vec<Declaration>,
diff --git a/compiler/mono/src/ir.rs b/compiler/mono/src/ir.rs
index fff3781af0..98b528d645 100644
--- a/compiler/mono/src/ir.rs
+++ b/compiler/mono/src/ir.rs
@@ -73,7 +73,8 @@ impl<'a> CapturedSymbols<'a> {
 #[derive(Clone, Debug, PartialEq)]
 pub struct PendingSpecialization<'a> {
     solved_type: SolvedType,
-    host_exposed_aliases: BumpMap<'a, Symbol, SolvedType>,
+    host_exposed_aliases: BumpMap<Symbol, SolvedType>,
+    _lifetime: std::marker::PhantomData<&'a u8>,
 }
 
 impl<'a> PendingSpecialization<'a> {
@@ -82,6 +83,7 @@ impl<'a> PendingSpecialization<'a> {
         PendingSpecialization {
             solved_type,
             host_exposed_aliases: BumpMap::new_in(arena),
+            _lifetime: std::marker::PhantomData,
         }
     }
 
@@ -104,6 +106,7 @@ impl<'a> PendingSpecialization<'a> {
         PendingSpecialization {
             solved_type,
             host_exposed_aliases,
+            _lifetime: std::marker::PhantomData,
         }
     }
 }
@@ -124,8 +127,8 @@ pub struct Proc<'a> {
 pub enum HostExposedLayouts<'a> {
     NotHostExposed,
     HostExposed {
-        rigids: BumpMap<'a, Lowercase, Layout<'a>>,
-        aliases: BumpMap<'a, Symbol, Layout<'a>>,
+        rigids: BumpMap<Lowercase, Layout<'a>>,
+        aliases: BumpMap<Symbol, Layout<'a>>,
     },
 }
 
@@ -239,13 +242,15 @@ impl<'a> Proc<'a> {
 
 #[derive(Clone, Debug)]
 pub struct ExternalSpecializations<'a> {
-    pub specs: BumpMap<'a, Symbol, MutSet<SolvedType>>,
+    pub specs: BumpMap<Symbol, MutSet<SolvedType>>,
+    _lifetime: std::marker::PhantomData<&'a u8>,
 }
 
 impl<'a> ExternalSpecializations<'a> {
     pub fn new_in(arena: &'a Bump) -> Self {
         Self {
             specs: BumpMap::new_in(arena),
+            _lifetime: std::marker::PhantomData,
         }
     }
 
@@ -276,16 +281,16 @@ impl<'a> ExternalSpecializations<'a> {
 
 #[derive(Clone, Debug)]
 pub struct Procs<'a> {
-    pub partial_procs: BumpMap<'a, Symbol, PartialProc<'a>>,
-    pub imported_module_thunks: BumpSet<'a, Symbol>,
-    pub module_thunks: BumpSet<'a, Symbol>,
+    pub partial_procs: BumpMap<Symbol, PartialProc<'a>>,
+    pub imported_module_thunks: BumpSet<Symbol>,
+    pub module_thunks: BumpSet<Symbol>,
     pub pending_specializations:
-        Option<BumpMap<'a, Symbol, MutMap<Layout<'a>, PendingSpecialization<'a>>>>,
-    pub specialized: BumpMap<'a, (Symbol, Layout<'a>), InProgressProc<'a>>,
-    pub runtime_errors: BumpMap<'a, Symbol, &'a str>,
-    pub call_by_pointer_wrappers: BumpMap<'a, Symbol, Symbol>,
+        Option<BumpMap<Symbol, MutMap<Layout<'a>, PendingSpecialization<'a>>>>,
+    pub specialized: BumpMap<(Symbol, Layout<'a>), InProgressProc<'a>>,
+    pub runtime_errors: BumpMap<Symbol, &'a str>,
+    pub call_by_pointer_wrappers: BumpMap<Symbol, Symbol>,
     pub externals_others_need: ExternalSpecializations<'a>,
-    pub externals_we_need: BumpMap<'a, ModuleId, ExternalSpecializations<'a>>,
+    pub externals_we_need: BumpMap<ModuleId, ExternalSpecializations<'a>>,
 }
 
 impl<'a> Procs<'a> {
@@ -681,11 +686,7 @@ impl<'a> Procs<'a> {
 }
 
 fn add_pending<'a>(
-    pending_specializations: &mut BumpMap<
-        'a,
-        Symbol,
-        MutMap<Layout<'a>, PendingSpecialization<'a>>,
-    >,
+    pending_specializations: &mut BumpMap<Symbol, MutMap<Layout<'a>, PendingSpecialization<'a>>>,
     symbol: Symbol,
     layout: Layout<'a>,
     pending: PendingSpecialization<'a>,
@@ -1860,10 +1861,7 @@ fn specialize_external<'a>(
         }
 
         HostExposedLayouts::HostExposed {
-            rigids: hashbrown::HashMap::with_hasher_in(
-                default_hasher(),
-                hashbrown::BumpWrapper(env.arena),
-            ),
+            rigids: BumpMap::new_in(env.arena),
             aliases,
         }
     };
@@ -2314,6 +2312,7 @@ fn specialize<'a>(
     let PendingSpecialization {
         solved_type,
         host_exposed_aliases,
+        ..
     } = pending;
 
     specialize_solved_type(
diff --git a/editor/src/lang/constrain.rs b/editor/src/lang/constrain.rs
index 304929893b..0fdc555f9b 100644
--- a/editor/src/lang/constrain.rs
+++ b/editor/src/lang/constrain.rs
@@ -32,7 +32,7 @@ pub enum Constraint<'a> {
 pub struct LetConstraint<'a> {
     pub rigid_vars: BumpVec<'a, Variable>,
     pub flex_vars: BumpVec<'a, Variable>,
-    pub def_types: BumpMap<'a, Symbol, Located<Type2>>,
+    pub def_types: BumpMap<Symbol, Located<Type2>>,
     pub defs_constraint: Constraint<'a>,
     pub ret_constraint: Constraint<'a>,
 }